Back River Volcanic Complex: an Archean stratovolcano, Nunavut-Northwest Territories
Bibliographic record
Abstract
The Back River volcanic complex is a deformed Archean composite stratovolcano that evolved in a depositional basin in the northeastern Slave Province. Its diverse stratigraphy developed through three cycles of mafic (or intermediate) to felsic volcanism, each ending with eruption of large rhyolite to dacite dome-flow complexes from numerous centres around the volcano, followed by erosion and mass wasting from the volcanic edifice to produce extensive clastic fans and debris-avalanche deposits. The oldest rocks in the volcanic complex are calc-alkaline andesitic lavas and ash-flow tuffs that represent the upper subaerial parts of the earliest cycle of volcanism. This cycle ended with cauldron subsidence, ring-fracture intrusion, and effusion of rhyolite domes. The second eruptive cycle involved a highly variable series of eruptions that deposited andesitic lava flows and intermittent pyroclastic and epiclastic units, to interlayered dacitic and andesitic lavas and tuffs overlain by voluminous, nonwelded, ash-flow tuffs. The last volcanic cycle marks a change to tholeiitic magmatism with the eruption mainly of basalt and andesite pillowed lavas on the submerged northern flanks of the stratovolcano. Stromatolites developed along the margins of active lava domes that straddled the shoreline around the emergent stratovolcano. Iron-formation units mark the close of volcanism. Three generations of folding deformed the volcanic complex and the surrounding metaturbidite units. Disharmonic folding produced tightly folded metasedimentary rocks between or against more open, folded volcanic sequences. The large dome in the southern part of the map area formed by superposition of regional strain on the core volcanic edifice.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.060 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".